Here's a couple pics of the Crown Victoria fan I installed on my truck-it's rated @ 4000-4400 CFM or so on high speed so I have it wired to the 3-speed harness I designed so now I have a nice, progressive electric fan which should prove superior to the mech. clutch type fan from before. I did need to trim about 1/2" off the shroud for clearance but with this massive integrated shroud it has, airflow is ridiculous!
Here's a pic of the thermostat housing I'm using-it had 2 ported vacuum switch locations which now serve as my low and medium temp switches to trigger 2 of the 3 speeds for my electric fan-the third is a high speed bypass for when I turn the AC on.
This system is protected by 50-amp MIDI style HD fuse and the whole relay setup only has 6 connections to make! Clean and easy!